Atrina fragilis (Pennant, 1777)
Pinnoidea : Pinnidae |
| Tebble name: | Pinna fragilis Pennant |
| Smith & Heppell name: | Atrina fragilis (Pennant, 1777) |
To size:
To 480mm.
Shell Structure:
Thin but strong, horny.
Equivalve:
Equivalve.
Equilateral:
Strongly inequilateral, beaks at the anterior end.
Outline:
Triangular, dorsal margin long and straight, posterior broad, gently curved but often damaged; ventral margin slightly sinuous.
Contour:
Posterior margins gape; small byssus gape at anterior ventral.
Sculpture:
Of comarginal lines and 8-12 low radiating ribs over the dorsal part of the shell, these ribs obscure or lost in large shells.
Margin:
Inner margin smooth with a few septa at the anterior tip.
Ligament:
External on a narrow resilifer extending 2/3 length of dorsal margin.
Hinge:
Lacking teeth.
Pallial Musculature:
Anterior adductor scar small at the anterior end behind the septa, posterior adductor scar large almost central; nacreous area not divided confined to anterior part of shell.
Periostracum:
Obscure.
Colour:
Shades of brownn.
Distribution & Ecology
Depth Range
Continental Shelf (to 200m)
Additional Information & Related Species
Additional Comments
The two species: Atrina fragilis and A. pectinata are geographically isolated - fragilis is European and pectinata from Indo-Pacific - and each is included in a different subgenus; fragilis in Atrina and pectinata in Servatrina.
Related Species
Pinnoidea : Pinnidae
References
Listed are literature citing Atrina fragilis (Pennant, 1777). Reference containing the species Type Description is highlighted.
|
Hanley S 1855. The shells of Linnaeus (Ipsa Linnaei Conchylia) Williams and Norgate, London. |
|
Linnaeus C 1758. Systema Naturae. Editio decima. 1. Regnum Animale Holmiae, Laurentii Salvii. 824pp. |
|
Pennant T 1777. British Zoology vol.IV. Crustacea, Mollusca, Testacea London, B. White. 154pp, 93pls. |
|
Rosewater J 1961. The family Pinnidae in the Indo-Pacific. Indo-Pacific Mollusca. 1 (4): 501-632. |
Resources
- Conchological Society
of Great Britain & Ireland
Provides resources for understanding, identifying, recording, and conserving molluscs - CLEMAM
Check List of European Marine Mollusca - MarLIN
The Marine Life Information Network for Britain and Ireland (MarLIN) provides information for marine environmental management, protection and education. It is a centre of excellence in spatially based and time-series marine biological information and supports good stewardship in the marine environment. - NBN Gateway
National Biodiversity Network's Gateway. Use it to explore UK biodiversity data, as contributed by participating data providers. - BivAToL
- MarBEF
- Malacological Society
- Unitas Malacologica
- Census of Marine Life
- MarBEF
MarBEF, a network of excellence funded by the European Union and consisting of 94 European marine institutes, is a platform to integrate and disseminate knowledge and expertise on marine biodiversity, with links to researchers, industry, stakeholders and the general public.
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